Hyein

In October 2018, The Singing Girls released a performance video for the single "This Night". In the video description, she, along with 3 other members, were introduced as new members of the group. She made her official debut with the group on March 27, 2019 with the digital single "Dream of Star".

The group also revealed that they would be re-debuting under the name Melody Pink. Melody Pink released the digital single "Hey U" on September 25, 2019. She left the group on October 12, 2020.